In the Eagles search for a defensive coordinator, there's been considerable attention paid toNFL experience. In fact, the presume frontrunner at this point is 49ers defensive backs coach Ed Donatell, with Georgia defensive coordinator Todd Grantham also previously discussed as a candidate. (The Eagles are not making any official announcement) Both have been coordinators in the NFL.

The term "retread" is often attached to a former head coach who gets a second chance, but the formula clearly works for defensive coordinators. Both coordinators in this season's Super Bowl -- Baltimore's Dean Pees and San Francisco's Vic Fangio -- have previously been defensive coordinators in the NFL.

In fact, this will be the fifth consecutive season in which the Super Bowl-winning defensive coordinator was on at least his second NFL defensive coordinator job: